chore(deploy-to-vercel): remove macOS Finder Archive.zip from skill directory

skills/deploy-to-vercel/Archive.zip looks unintentional, likely a leftover from packaging in #149:

• macOS Finder default name, includes __MACOSX/ entries
• its SKILL.md is an older draft, missing the team selection flow (vercel teams list, --scope <team-slug>)
• it sits inside the skill directory, so build-discovery-index.mjs ships it with the published deploy-to-vercel artifact

skills/deploy-to-vercel.zip and the other root-level zips match their skill directories, so they're left alone.

Verification

• node scripts/build-discovery-index.mjs https://example.com/skills passes (same check as the Discovery workflow)
• dist/deploy-to-vercel.tar.gz now contains only SKILL.md and resources/

Related

• #176 removes this file too, but also deletes the root-level zips, adds *.zip to .gitignore, and has merge conflicts. This PR is just the one file.
• #262 regenerates this file, so whichever lands second needs a small rebase.

Feel free to close if intentional (and if so, sorry for the noise!)